2.6.27-stable review patch. If anyone has any objections, please let us know.

------------------From: Takashi Iwai <tiwai@suse.de>

commit 0cbf00980f0fc4cc064a15ab3dfce19b5fae9130 upstream

The current snd-hda-intel driver seems blocking the power-off on somedevices like eeepc. Although this is likely a BIOS problem, we can adda workaround by disabling IRQ lines before power-off operation.This patch adds the reboot notifier to achieve it.